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DONNEES NOUVELLES SUR L'APPORT DE NUTRILITES DU DANUBE ET LEUR
NIVEAU DE CONCENTRATION DANS LA ZONE DU LITTORAL ROUMAINE


Lucia Popa et Liliana Dorogan

Institute Roumain de Recherches Marines Constanta

Abstract
This study was intended to determine the actual level of nutrients,
the temporal variations and the tendency of their evolution in the
Danube and inshore marine waters of the Romanian Black Sea littoral.
Based on daily measurements at Sulina and Constanta between Dec.1991
and Nov.1992, the paper points out the decrease of the global
contribution of nutrients (NO3, PO4, SiO4) from the Danube from
984,7 x 10?3 tons in 1988-1990 to 942,5 x 10?3 tons at present and an
obvious and significant decrease of their average concentrations in
inshore marine waters. In addition, the distribution features as well
as temporal and spatial variations of nutrients during July 1989 and
May 1992 in the pre-deltaic area are discussed. High contents of 
nitrates and silicates were found in the low salinity shallow waters
along this eutrophication area.